It was last seen when Arthas engaged Kael in a duel during the final battle between the Lich King's Scourge led by Arthas Menethil, and Kil'jaeden's agents led by Illidan Stormrage. Kael boasted that unlike human blades, which weakened when repaired, elven blades grew stronger when remade; this proved true, much to Arthas's surprise, when the runeblade was able to parry Frostmourne without failing. Though Kael ultimately fled with the sword, likely carrying it to Outland, its current fate is unknown.

This section concerns content exclusive to the Warcraft RPG, and thus unlikely to be canon.

In Manual of Monsters, Flamestrike grants its wielder an increased chance to hit, increased damage, and an increased chance of scoring a critical hit. It adds fire damage to every attack (more so on a critical hit) and also allows its wielder to cast the flame strike spell five times per day.[6]

Felo'melorn was first mentioned in the Manual of Monsters as only Flamestrike, and then expanded upon in Arthas: Rise of the Lich King. It is not part of Kael'thas's loot table in either the Eye or Magisters' Terrace.